VirtQueue *ctrl_vq;
NICState *nic;
QEMUTimer *tx_timer;
- int tx_timer_active;
+ QEMUBH *tx_bh;
+ uint32_t tx_timeout;
+ int32_t tx_burst;
+ int tx_waiting;
uint32_t has_vnet_hdr;
uint8_t has_ufo;
struct {
uint8_t nouni;
uint8_t nobcast;
uint8_t vhost_started;
- VMChangeStateEntry *vmstate;
struct {
int in_use;
int first_multi;
uint8_t *macs;
} mac_table;
uint32_t *vlans;
+ DeviceState *qdev;
} VirtIONet;
/* TODO
VirtIONet *n = to_virtio_net(vdev);
struct virtio_net_config netcfg;
- netcfg.status = n->status;
+ stw_p(&netcfg.status, n->status);
memcpy(netcfg.mac, n->mac, ETH_ALEN);
memcpy(config, &netcfg, sizeof(netcfg));
}
}
}
+static bool virtio_net_started(VirtIONet *n, uint8_t status)
+{
+ return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ (n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running;
+}
+
+static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
+{
+ if (!n->nic->nc.peer) {
+ return;
+ }
+ if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
+ return;
+ }
+
+ if (!tap_get_vhost_net(n->nic->nc.peer)) {
+ return;
+ }
+ if (!!n->vhost_started == virtio_net_started(n, status) &&
+ !n->nic->nc.peer->link_down) {
+ return;
+ }
+ if (!n->vhost_started) {
+ int r;
+ if (!vhost_net_query(tap_get_vhost_net(n->nic->nc.peer), &n->vdev)) {
+ return;
+ }
+ r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
+ if (r < 0) {
+ error_report("unable to start vhost net: %d: "
+ "falling back on userspace virtio", -r);
+ } else {
+ n->vhost_started = 1;
+ }
+ } else {
+ vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
+ n->vhost_started = 0;
+ }
+}
+
+static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
+{
+ VirtIONet *n = to_virtio_net(vdev);
+
+ virtio_net_vhost_status(n, status);
+
+ if (!n->tx_waiting) {
+ return;
+ }
+
+ if (virtio_net_started(n, status) && !n->vhost_started) {
+ if (n->tx_timer) {
+ qemu_mod_timer(n->tx_timer,
+ qemu_get_clock_ns(vm_clock) + n->tx_timeout);
+ } else {
+ qemu_bh_schedule(n->tx_bh);
+ }
+ } else {
+ if (n->tx_timer) {
+ qemu_del_timer(n->tx_timer);
+ } else {
+ qemu_bh_cancel(n->tx_bh);
+ }
+ }
+}
+
static void virtio_net_set_link_status(VLANClientState *nc)
{
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
if (n->status != old_status)
virtio_notify_config(&n->vdev);
+
+ virtio_net_set_status(&n->vdev, n->vdev.status);
}
static void virtio_net_reset(VirtIODevice *vdev)
n->nomulti = 0;
n->nouni = 0;
n->nobcast = 0;
- if (n->vhost_started) {
- vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev);
- n->vhost_started = 0;
- }
/* Flush any MAC and VLAN filter table state */
n->mac_table.in_use = 0;
if (!tap_get_vhost_net(n->nic->nc.peer)) {
return;
}
- return vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
+ vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
}
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
uint8_t on;
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
- fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
+ error_report("virtio-net ctrl invalid rx mode command");
exit(1);
}
n->mac_table.multi_overflow = 0;
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
- mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
+ mac_data.entries = ldl_p(elem->out_sg[1].iov_base);
if (sizeof(mac_data.entries) +
(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
n->mac_table.first_multi = n->mac_table.in_use;
- mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
+ mac_data.entries = ldl_p(elem->out_sg[2].iov_base);
if (sizeof(mac_data.entries) +
(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
uint16_t vid;
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
- fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
+ error_report("virtio-net ctrl invalid vlan command");
return VIRTIO_NET_ERR;
}
- vid = lduw_le_p(elem->out_sg[1].iov_base);
+ vid = lduw_p(elem->out_sg[1].iov_base);
if (vid >= MAX_VLAN)
return VIRTIO_NET_ERR;
while (virtqueue_pop(vq, &elem)) {
if ((elem.in_num < 1) || (elem.out_num < 1)) {
- fprintf(stderr, "virtio-net ctrl missing headers\n");
+ error_report("virtio-net ctrl missing headers");
exit(1);
}
if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
- fprintf(stderr, "virtio-net ctrl header not in correct element\n");
+ error_report("virtio-net ctrl header not in correct element");
exit(1);
}
static int virtio_net_can_receive(VLANClientState *nc)
{
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
+ if (!n->vdev.vm_running) {
+ return 0;
+ }
if (!virtio_queue_ready(n->rx_vq) ||
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
{
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
- size_t hdr_len, offset, i;
+ size_t guest_hdr_len, offset, i, host_hdr_len;
if (!virtio_net_can_receive(&n->nic->nc))
return -1;
- if (!virtio_net_has_buffers(n, size))
+ /* hdr_len refers to the header we supply to the guest */
+ guest_hdr_len = n->mergeable_rx_bufs ?
+ sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
+
+
+ host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
+ if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len))
return 0;
if (!receive_filter(n, buf, size))
return size;
- /* hdr_len refers to the header we supply to the guest */
- hdr_len = n->mergeable_rx_bufs ?
- sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
-
offset = i = 0;
while (offset < size) {
total = 0;
- if ((i != 0 && !n->mergeable_rx_bufs) ||
- virtqueue_pop(n->rx_vq, &elem) == 0) {
+ if (virtqueue_pop(n->rx_vq, &elem) == 0) {
if (i == 0)
return -1;
- fprintf(stderr, "virtio-net truncating packet\n");
+ error_report("virtio-net unexpected empty queue: "
+ "i %zd mergeable %d offset %zd, size %zd, "
+ "guest hdr len %zd, host hdr len %zd guest features 0x%x",
+ i, n->mergeable_rx_bufs, offset, size,
+ guest_hdr_len, host_hdr_len, n->vdev.guest_features);
exit(1);
}
if (elem.in_num < 1) {
- fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
+ error_report("virtio-net receive queue contains no in buffers");
exit(1);
}
- if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
- fprintf(stderr, "virtio-net header not in first element\n");
+ if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) {
+ error_report("virtio-net header not in first element");
exit(1);
}
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
offset += receive_header(n, sg, elem.in_num,
- buf + offset, size - offset, hdr_len);
- total += hdr_len;
+ buf + offset, size - offset, guest_hdr_len);
+ total += guest_hdr_len;
}
/* copy in packet. ugh */
len = iov_from_buf(sg, elem.in_num,
buf + offset, size - offset);
total += len;
+ offset += len;
+ /* If buffers can't be merged, at this point we
+ * must have consumed the complete packet.
+ * Otherwise, drop it. */
+ if (!n->mergeable_rx_bufs && offset < size) {
+#if 0
+ error_report("virtio-net truncated non-mergeable packet: "
+ "i %zd mergeable %d offset %zd, size %zd, "
+ "guest hdr len %zd, host hdr len %zd",
+ i, n->mergeable_rx_bufs,
+ offset, size, guest_hdr_len, host_hdr_len);
+#endif
+ return size;
+ }
/* signal other side */
virtqueue_fill(n->rx_vq, &elem, total, i++);
-
- offset += len;
}
- if (mhdr)
- mhdr->num_buffers = i;
+ if (mhdr) {
+ stw_p(&mhdr->num_buffers, i);
+ }
virtqueue_flush(n->rx_vq, i);
virtio_notify(&n->vdev, n->rx_vq);
return size;
}
-static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
+static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len)
{
}
/* TX */
-static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
+static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
{
VirtQueueElement elem;
+ int32_t num_packets = 0;
+ if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return num_packets;
+ }
- if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
- return;
+ assert(n->vdev.vm_running);
if (n->async_tx.elem.out_num) {
virtio_queue_set_notification(n->tx_vq, 0);
- return;
+ return num_packets;
}
while (virtqueue_pop(vq, &elem)) {
sizeof(struct virtio_net_hdr);
if (out_num < 1 || out_sg->iov_len != hdr_len) {
- fprintf(stderr, "virtio-net header not in first element\n");
+ error_report("virtio-net header not in first element");
exit(1);
}
virtio_queue_set_notification(n->tx_vq, 0);
n->async_tx.elem = elem;
n->async_tx.len = len;
- return;
+ return -EBUSY;
}
len += ret;
virtqueue_push(vq, &elem, len);
virtio_notify(&n->vdev, vq);
+
+ if (++num_packets >= n->tx_burst) {
+ break;
+ }
}
+ return num_packets;
}
-static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
+static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = to_virtio_net(vdev);
- if (n->tx_timer_active) {
+ /* This happens when device was stopped but VCPU wasn't. */
+ if (!n->vdev.vm_running) {
+ n->tx_waiting = 1;
+ return;
+ }
+
+ if (n->tx_waiting) {
virtio_queue_set_notification(vq, 1);
qemu_del_timer(n->tx_timer);
- n->tx_timer_active = 0;
+ n->tx_waiting = 0;
virtio_net_flush_tx(n, vq);
} else {
qemu_mod_timer(n->tx_timer,
- qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
- n->tx_timer_active = 1;
+ qemu_get_clock_ns(vm_clock) + n->tx_timeout);
+ n->tx_waiting = 1;
virtio_queue_set_notification(vq, 0);
}
}
+static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = to_virtio_net(vdev);
+
+ if (unlikely(n->tx_waiting)) {
+ return;
+ }
+ n->tx_waiting = 1;
+ /* This happens when device was stopped but VCPU wasn't. */
+ if (!n->vdev.vm_running) {
+ return;
+ }
+ virtio_queue_set_notification(vq, 0);
+ qemu_bh_schedule(n->tx_bh);
+}
+
static void virtio_net_tx_timer(void *opaque)
{
VirtIONet *n = opaque;
+ assert(n->vdev.vm_running);
- n->tx_timer_active = 0;
+ n->tx_waiting = 0;
/* Just in case the driver is not ready on more */
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
virtio_net_flush_tx(n, n->tx_vq);
}
-static void virtio_net_save(QEMUFile *f, void *opaque)
+static void virtio_net_tx_bh(void *opaque)
{
VirtIONet *n = opaque;
+ int32_t ret;
- if (n->vhost_started) {
- /* TODO: should we really stop the backend?
- * If we don't, it might keep writing to memory. */
- vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
- n->vhost_started = 0;
+ assert(n->vdev.vm_running);
+
+ n->tx_waiting = 0;
+
+ /* Just in case the driver is not ready on more */
+ if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
+ return;
+
+ ret = virtio_net_flush_tx(n, n->tx_vq);
+ if (ret == -EBUSY) {
+ return; /* Notification re-enable handled by tx_complete */
+ }
+
+ /* If we flush a full burst of packets, assume there are
+ * more coming and immediately reschedule */
+ if (ret >= n->tx_burst) {
+ qemu_bh_schedule(n->tx_bh);
+ n->tx_waiting = 1;
+ return;
}
+
+ /* If less than a full burst, re-enable notification and flush
+ * anything that may have come in while we weren't looking. If
+ * we find something, assume the guest is still active and reschedule */
+ virtio_queue_set_notification(n->tx_vq, 1);
+ if (virtio_net_flush_tx(n, n->tx_vq) > 0) {
+ virtio_queue_set_notification(n->tx_vq, 0);
+ qemu_bh_schedule(n->tx_bh);
+ n->tx_waiting = 1;
+ }
+}
+
+static void virtio_net_save(QEMUFile *f, void *opaque)
+{
+ VirtIONet *n = opaque;
+
+ /* At this point, backend must be stopped, otherwise
+ * it might keep writing to memory. */
+ assert(!n->vhost_started);
virtio_save(&n->vdev, f);
qemu_put_buffer(f, n->mac, ETH_ALEN);
- qemu_put_be32(f, n->tx_timer_active);
+ qemu_put_be32(f, n->tx_waiting);
qemu_put_be32(f, n->mergeable_rx_bufs);
qemu_put_be16(f, n->status);
qemu_put_byte(f, n->promisc);
virtio_load(&n->vdev, f);
qemu_get_buffer(f, n->mac, ETH_ALEN);
- n->tx_timer_active = qemu_get_be32(f);
+ n->tx_waiting = qemu_get_be32(f);
n->mergeable_rx_bufs = qemu_get_be32(f);
if (version_id >= 3)
}
}
n->mac_table.first_multi = i;
-
- if (n->tx_timer_active) {
- qemu_mod_timer(n->tx_timer,
- qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
- }
return 0;
}
.link_status_changed = virtio_net_set_link_status,
};
-static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
-{
- VirtIONet *n = to_virtio_net(vdev);
- if (!n->nic->nc.peer) {
- return;
- }
- if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
- return;
- }
-
- if (!tap_get_vhost_net(n->nic->nc.peer)) {
- return;
- }
- if (!!n->vhost_started == !!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
- return;
- }
- if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
- int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), vdev);
- if (r < 0) {
- fprintf(stderr, "unable to start vhost net: %d: "
- "falling back on userspace virtio\n", -r);
- } else {
- n->vhost_started = 1;
- }
- } else {
- vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev);
- n->vhost_started = 0;
- }
-}
-
-static void virtio_net_vmstate_change(void *opaque, int running, int reason)
-{
- VirtIONet *n = opaque;
- if (!running) {
- return;
- }
- /* This is called when vm is started, it will start vhost backend if
- * appropriate e.g. after migration. */
- virtio_net_set_status(&n->vdev, n->vdev.status);
-}
-
-VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf)
+VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
+ virtio_net_conf *net)
{
VirtIONet *n;
- static int virtio_net_id;
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
sizeof(struct virtio_net_config),
n->vdev.reset = virtio_net_reset;
n->vdev.set_status = virtio_net_set_status;
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
- n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
+
+ if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) {
+ error_report("virtio-net: "
+ "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
+ net->tx);
+ error_report("Defaulting to \"bh\"");
+ }
+
+ if (net->tx && !strcmp(net->tx, "timer")) {
+ n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
+ n->tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, n);
+ n->tx_timeout = net->txtimer;
+ } else {
+ n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
+ n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n);
+ }
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
qemu_macaddr_default_if_unset(&conf->macaddr);
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac));
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a);
- n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
- n->tx_timer_active = 0;
+ n->tx_waiting = 0;
+ n->tx_burst = net->txburst;
n->mergeable_rx_bufs = 0;
n->promisc = 1; /* for compatibility */
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
- register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
+ n->qdev = dev;
+ register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
virtio_net_save, virtio_net_load, n);
- n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n);
+
+ add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
return &n->vdev;
}
void virtio_net_exit(VirtIODevice *vdev)
{
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev);
- qemu_del_vm_change_state_handler(n->vmstate);
- if (n->vhost_started) {
- vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev);
- }
+ /* This will stop vhost backend if appropriate. */
+ virtio_net_set_status(vdev, 0);
qemu_purge_queued_packets(&n->nic->nc);
- unregister_savevm("virtio-net", n);
+ unregister_savevm(n->qdev, "virtio-net", n);
qemu_free(n->mac_table.macs);
qemu_free(n->vlans);
- qemu_del_timer(n->tx_timer);
- qemu_free_timer(n->tx_timer);
+ if (n->tx_timer) {
+ qemu_del_timer(n->tx_timer);
+ qemu_free_timer(n->tx_timer);
+ } else {
+ qemu_bh_delete(n->tx_bh);
+ }
virtio_cleanup(&n->vdev);
qemu_del_vlan_client(&n->nic->nc);
projects / qemu.git / blobdiff